Weikusat, Ilka; Kuiper, Ernst-Jan N; de Bresser, Johannes H P; Jansen, Daniela; Pennock, Gillian M; Drury, Martyn R (2020): A composite flow law to model deformation in the NEEM deep ice core, Greenland - The role of grain size, grain size distribution and premelting on ice deformation [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.920005
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Abstract:
Results from a rheological model based on the composite flow law of Goldsby and Kohlstedt (1997, 2001) applied to mean grain size and grain size distributions in the North Greenland Eemian Ice Drilling (NEEM) deep ice core predict that grain-size-sensitive flow produces almost all of the deformation in the upper 2207 m, while dislocation creep hardly contributes to deformation. The difference in calculated strain rate between two model end-members is relatively small: (i) the micro-scale constant stress model where each grain deforms by the same stress and (ii) the micro-scale constant strain rate model where each grain deforms by the same strain rate. The predicted strain rate in the fine-grained Glacial ice (that is, ice deposited during the Last Glacial Maximum now at depths of 1419 to 2207 m) varies strongly within this depth range. Predicted strain rate is about 4-5 times higher than in the coarser-grained Holocene ice (0-1419 m). Two peaks in strain rate are predicted at about 1980 and 2100 m of depth. See also interpretations in publication (Kuiper et al. 2020 TC).
Related to:
Kipfstuhl, Sepp: Large area scan macroscope images from the NEEM ice core. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.743296
Kuiper, Ernst-Jan N; de Bresser, Johannes H P; Drury, Martyn R; Eichler, Jan; Pennock, Gillian M; Weikusat, Ilka (2020): Using a composite flow law to model deformation in the NEEM deep ice core, Greenland: Part 2 the role of grain size and premelting on ice deformation at high homologous temperature. The Cryosphere, https://doi.org/10.5194/tc-2018-275
Kuiper, Ernst-Jan N; Weikusat, Ilka; de Bresser, Johannes H P; Jansen, Daniela; Pennock, Gillian M; Drury, Martyn R (2020): Using a composite flow law to model deformation in the NEEM deep ice core, Greenland: Part 1 the role of grain size and grain size distribution on the deformation of Holocene and glacial ice. The Cryosphere, https://doi.org/10.5194/tc-2018-274
Weikusat, Ilka; Binder, Tobias; Kipfstuhl, Sepp (2020): Structural grain parameters from image analysis of large area scan macroscope images from the NEEM ice core. PANGAEA, https://doi.org/10.1594/PANGAEA.919775
Further details:
Binder, Tobias (2014): Measurements of grain boundary networks in deep polar ice cores - A digital image processing approach. Heidelberg University Library, Dissertation, https://doi.org/10.11588/heidok.00016891
Binder, Tobias; Garbe, Christoph S; Wagenbach, Dietmar; Freitag, Johannes; Kipfstuhl, Sepp (2013): Extraction and parametrization of grain boundary networks in glacier ice, using a dedicated method of automatic image analysis. Journal of Microscopy, 250(2), 130-141, https://doi.org/10.1111/jmi.12029
Binder, Tobias; Weikusat, Ilka; Freitag, Johannes; Garbe, Christoph S; Wagenbach, Dietmar; Kipfstuhl, Sepp (2013): Microstructure through an Ice Sheet. Materials Science Forum, 753, 481-484, https://doi.org/10.4028/www.scientific.net/MSF.753.481
Goldsby, David; Kohlstedt, David (1997): Grain boundary sliding in fine-grained Ice I. Scripta Materialia, 37(9), 1399-1406, https://doi.org/10.1016/S1359-6462(97)00246-7
Goldsby, David; Kohlstedt, David (2001): Superplastic deformation of ice: Experimental observations. Journal of Geophysical Research: Solid Earth, 106(B6), 11017-11030, https://doi.org/10.1029/2000JB900336
Project(s):
Funding:
Agence Nationale de la Recherche (ANR), grant/award no. 07-VULN-09-001: North Greenland Eemian Ice Drilling
Coverage:
Latitude: 77.450000 * Longitude: -51.060000
Date/Time Start: 2009-05-01T00:00:00 * Date/Time End: 2009-08-20T00:00:00
Minimum Elevation: 2545.0 m * Maximum Elevation: 2545.0 m
Event(s):
NEEM * Latitude: 77.450000 * Longitude: -51.060000 * Date/Time Start: 2009-05-01T00:00:00 * Date/Time End: 2009-08-20T00:00:00 * Elevation: 2545.0 m * Recovery: 2533.21 m * Location: Greenland * Method/Device: Ice drill (ICEDRILL)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | File content | Content | Weikusat, Ilka | |||
| 2 | File name | File name | Weikusat, Ilka | |||
| 3 | File format | File format | Weikusat, Ilka | |||
| 4 | File size | File size | kByte | Weikusat, Ilka | ||
| 5 | Uniform resource locator/link to file | URL file | Weikusat, Ilka |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
10 data points